Pressure foot for sewing machines



Aug. 25, 1964 MICHIO KURIHARA PRESSURE FOOT FOR SEWING MACHINES FiledJan. 2, 1963 ATTORNEYS United States Patent 3,145,674 PRESSURE FOOT FORSEWING MACHINES Miehio Kurihara, Tokyo, Japan, assignor to KoshinSeimitsu Kikai Kabushiki Kaisha, Tokyo, Japan, a corporation of JapanFiled Jan. 2, 1963, Ser. No. 248,962 Claims priority, application JapanJune 12, 1962 1 Claim. (Cl. 112-240) The present invention is concernedwith an improvement in pressure feet for sewing machines.

Sewing machines as conventionally known generally include a pressurefoot bar to which a pressure foot is detachably connected. For each typeof stitching to be carried out by the sewing machine a correspondingtype of pressure foot is connected to the pressure foot bar. For examplethere is a different pressure foot for a straight stitch or for hemmingor the like and it is necessary to change the pressure feet inaccordance with the intended type of stitch to be performed by detachingthe pressure foot on the sewing machine and replacing with the correcttype. This necessitates producing a complete pressure foot for each typeof stitch and loosening and fastening a set screw on the sewing machinefor changing each pressure foot which is relatively expensive andtroublesome.

It is accordingly an object of the present invention to provide animproved pressure foot which has a shank detachably connectable to asewing machine pressure foot bar and a pressure shoe quickly and easilydetachable and attachable to the shank so that only the pressure shoe isproduced and used for each type of stitching and the same shank can beused with all of the various pressure shoes.

Furter objects of the invention will be in part obvious and in partpointed out in the following detailed description of the accompanyingdrawings, in which:

FIG. 1 is a side elevation of a pressure foot according to the presentinvention which is shown connected to a conventional sewing machinepressure foot bar,

FIG. 2 is a cross-sectional view taken along the line 22 in FIG. 1,

FIG. 3 is a plan view of a pressure shoe forming a part of the presentpressure foot,

FIG. 4 is an exploded perspective partial view of the same,

FIG. 5 is a front view of a shank also forming a part of the presentpressure foot, and

FIG. 6 is an enlarged detailed sectional view of a portion of thepressure foot.

Referring now more in detail to the accompanying drawing, wherein likeand corresponding par-ts are designated by similar reference characters,numeral 1 generally designates the present pressure foot which comprisesa shank 2 and a pressure shoe 3. Said shank 2 has a longitudinal sidegroove 4 in its upper end portion and a slot 5 in said end for receivingthe conventional foot bar 6 of a sewing machine and its connecting setscrew 7, respectively as shown in FIGS. 1 and 2, whereby said shank3,145,674 Patented Aug. 25, 1964 detachably extends from said pressurefoot bar 6. Said shank 2 is forked at its lower end to form a pair ofarms 8 and 8 with an axle 9 fixedly connected to and extending betweensaid arms 8 and 8'. Said pressure shoe 3 is provided on its uppersurface with a pair of upwardly pro jecting cars 10 and 10 having a pairof receiving grooves 11 and 11' provided in the upper surface thereofand also with a leaf spring 12 disposed between said pair of ears 10 and10'. Said spring 12 is fixed at its rear end 13 to said shoe 3 and isfree at its top front end portion 14, and said free front top endportion 14 is curved upwardly from the flat remaining portion of saidspring into an arc positioned somewhat inwardly of the front or lefthand inner surfaces of said grooves 15 and 15' of said pair of grooves11 and 11 as viewed in FIG. 6. The rear end 13 of the spring 12 may befixed to said shoe 3 by any conventional means such as welding, boltingor the like, but in the embodiment shown on the drawing the same isenlarged in width providing a pair of laterally extending portions 16and 16' and is fixed to said shoe by inserting said portions 16 and 16'into a pair of slits 17 and 17' provided in the rear surface of saidears 10 and 10'. Thus, by inserting said axle 9 into and across saidgrooves 11 and 11' until the same is held by said free front end of saidspring 12, said shoe 3 will be detachably connected to said shank 2.

It is to be appreciated that pressure shoes 3 of other configurationsthan that shown can be used. Thus by selecting the proper shoe 3 for thestitch to be made it can be attached to shank 2 without removing theshank from bar 6 and the shoes can be interchanged as desired.

The present invention is capable of considerable modification and suchchanges thereto as come within the scope of the appended claim aredeemed a part of the invention.

I claim:

A pressure foot for a sewing machine having a pressure foot barcomprising a shank detachably connectable to the sewing machine pressurefoot bar, an axle carried by said sank, a pressure shoe, a pair ofspaced-apart ears extending from said pressure shoe each having a toprecess capable of receiving a portion of said axle and an end slit, aspring having a flat portion with a pair of laterally projectingportions each inserted in one of said ear slits connecting said springto said pressure shoe and a curved free end portion extending laterallyof and between said ear recesses and capable of detachably engaging andretaining said axle when in said ear recesses for connecting saidpressure shoe to said shank.

